Improve ConnectivityManager.getNetworkWatchlistConfigHash() javadoc

Test: NULL
Bug: 74831039
Change-Id: I227ba1377a51821204cd5830e7da6ff3a15bca02
diff --git a/core/java/android/net/ConnectivityManager.java b/core/java/android/net/ConnectivityManager.java
index 36f359b..82f79d3 100644
--- a/core/java/android/net/ConnectivityManager.java
+++ b/core/java/android/net/ConnectivityManager.java
@@ -3858,8 +3858,8 @@
 
     /**
      * The network watchlist is a list of domains and IP addresses that are associated with
-     * potentially harmful apps. This method returns the hash of the watchlist currently
-     * used by the system.
+     * potentially harmful apps. This method returns the SHA-256 of the watchlist config file
+     * currently used by the system for validation purposes.
      *
      * @return Hash of network watchlist config file. Null if config does not exist.
      */